Glyoxal adhesive system and process for manufacturing same

ABSTRACT

An optical adhesive product and a process for manufacturing an optical adhesive product, laminated film ensembles, and laminated lenses. The optical adhesive product includes a glyoxal water solution that is pH adjusted for use as an optical adhesive that demonstrates a wet peel three strength above about 6 Newtons. A water based polymer, such as PVOH, may be added to the adhesive system. According to the process, the glyoxal adhesive system is manufactured and utilized to laminate TAC-PVA-TAC films together to form a polar film ensemble. The polar film ensemble is laminated to an optical substrate and in the case of an ophthalmic lens, surfaced, coated and edged. The optical adhesive product avoids film separation in the polar TAC-PAV-TAC film ensemble during edging

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a polarized optical article whichmaintaines its integrity after typical processing of an optical articlewhich includes edging. Delamination of the polarizing wafer can beprevented by using a glyoxal adhesive system and process formanufacturing same.

2. The Prior Art

According to the prior art, glyoxal is widely used as a film additive,for example to improve the properties of polyvinyl alcohol (PVA) films.In the Polymer Journal, Vol 25, No. 12, pp 1295-1302 (1993) articleentitled Effects of the Degree of Cross Linking on Properties of PVAMembranes, the authors propose using glyoxal and glutaraldehyde as filmadditives. In the Korean J. of Chem. Eng, 11(1), 41-47(1994) the articlestates that “to increase the stability of PVA membrane to water, itshould be cross linked with an aldehyde”. The article proposes to useglutaraldehyde as the aldehyde of choice. Similarly, U.S. Pat. No.4,357,402 describes preparing a film and cross-linking with a dialdehydesuch as glyoxal or polyaldehydepolysaccharide compounds.

U.S. Pat. No. 5,114,999 discloses using glyoxal as a binderinsolubilizer in a paper coating composition. U.S. Pat. No. 5,496,649mentions that PVA is susceptible to moisture and to decrease itssensitivity one could cross-link using formaldehyde/acid. Generalcross-linking of PVA using dialdehydes is described in U.S. Pat. No.4,902,464.

Glyoxal is also used as a crosslinking agent in adhesive formulations,for example, as a crosslinking agent for polyvinyl alcohol (PVOH)adhesive used in PVA and cellulose triacetate (TAC) film lamination.Glyoxal is a well known crosslinking agent within the PVA film industryto improve water resistance. However, there has not been a suggestion touse it as an adhesive to bond PVA polarizing film and TAC film. Furthermore, in the prior art like U.S. Pat. No. 7,704,572, glyoxal is alwaysused as an additive, for example as a cross-linking agent used in aminor quantity in an adhesive where the adhesive represents the maincomponent of the formulation. Other approaches suggest using metalcrosslinking materials (U.S. Published Patent Application 2008/0278810)and other crosslinking agents such as glyoxal (U.S. Published PatentApplication 2006/0155061) in PVOH adhesive to improve the film's waterresistance. However, tests using these proposed adhesives failed toachieve the minimum requirements for adhesion. Therefore an adhesionproblem arises that needs a solution.

In all of the prior approaches, glyoxal was used as a film additive orcrosslinking agent and not as the main adhesive component. It is ourdesire to improve wet edging and wet adhesion performance in thepresence of water. Therefore, it would be desirable to provide anadhesive to form a TAC/PVA/TAC polarizing film ensemble with improvedwet adhesion. Furthermore, it would useful to employ such an adhesive ina polarizing film ensemble laminated to a lens which is then wet edged.

SUMMARY OF THE INVENTION

Accordingly, it is an object of an embodiment of the invention toprovide an adhesive to form a polarizing film ensemble with improved wetadhesion.

It is a further object to provide such an adhesive with acceptableperformance during edging operations in ophthalmic lens applications.

It is another object to employ such an adhesive in a process of forminga polarizing film ensemble, laminating the polarizing film ensemble to alens surface and then surfacing the lens and custom edging to fit aframe for a wearer.

It is a further object to provide an aldehyde based adhesive system andmore specifically a glyoxal based adesive system for the variousproducts, applications and processes.

It is another object to specify the compounds, and ranges to formulatethe glyoxal based adhesive.

These and other related objects according to embodiments of theinvention are achieved by an optical adhesive product and a process formanufacturing an optical adhesive product, laminated film ensembles, andlaminated lenses.

According to an embodiment of the invention, there is provided anoptical adhesive product for improved wet adhesion. The optical adhesiveproduct includes a glyoxal water solution containing between about 5%and about 50% by weight glyoxal and adjusted to a pH below about 7. Theoptical adhesive product comprises an adhesive for laminated ophthalmiclens that demonstrates a wet peel force strength above about 6 Newtons.

The glyoxal water solution consists of glyoxal present in an amountbetween 30% and 50% by weight, less than 1% by weight of a pH adjustingcompound, and the remainder water. The optical adhesive product isdevoid of other compounds and demonstrates a wet peel force strengthbetween about 8 to about 12 Newtons. The pH adjusting compound ishydrochloric acid (HCl) and the optical adhesive product is adjusted toa pH below about 6.

The optical adhesive product may contain a water based polymer that ispresent in an amount less than or equal to the amount of glyoxal.According to this formulation, the optical adhesive product containsglyoxal in an amount between about 3% and 40% by weight and the waterbased polymer present in an amount between 2% and 6% by weight. Thewater based polymer is preferably polyvinyl alcohol (PVOH) polymer. Theproduct would also contain less than 1% by weight of a pH adjustingcompound, and the remainder water. The optical adhesive productdemonstrates a wet peel force strength between about 6 to about 18Newtons.

In another formulation, the glyoxal is present in an amount of about 5%-10% by weight and the PVOH is present in an amount of about 3%-4% byweight. The optical adhesive product demonstrates a wet peel forcestrength between about 10 to about 16 Newtons. The water based polymermay be water based polymers containing OH groups in the structure,polyurethanes (PU) containing hydroxy groups, hydroxyethyl cellulose,hydroxypropyl cellulose, sodium carboxymethyl cellulose, or agarose.

In an alternate embodiment, there is provided a process formanufacturing an optical adhesive product for improved wet adhesion inlaminated opthalmic lenses. According to the process, a glyoxal watersolution is provided containing between about 3% and about 40% by weightglyoxal. An acid is added for adjusting the pH of the glyoxal watersolution to below about 6 to form the optical adhesive product thatdemonstrates a wet peel force strength above about 6 Newtons.

The optical adhesive product may further include adding a water basedpolymer in an amount less than the glyoxal water solution. The opticaladhesive product includes glyoxal present in an amount between about 3%and 40% by weight, and the water based polymer comprising polyvinylalcohol (PVOH) polymer present in an amount between 2% and 4% by weight.The product would also contain less than 1% by weight of the acid andthe remainder water. The optical adhesive product demonstrates a wetpeel force strength between about 6 to about 18 Newtons.

In a further formulation, the glyoxal is present in an amount of about5%-10% by weight and the PVOH is present in an amount of about 3%-4% byweight. The optical adhesive product demonstrates a wet peel forcestrength between about 10 to about 16 Newtons. The water based polymermay be water based polymers containing OH groups in the structure,polyurethanes (PU) containing hydroxy groups, hydroxyethyl cellulose,hydroxypropyl cellulose, sodium carboxymethyl cellulose, or agarose. Theacid is hydrochloric acid (HCl).

The process, following the adding step, further includes providingoptical films, introducing the optical adhesive product between thefilms, and laminating the optical films together. The optical films aretwo triacetate cellulose (TAC) films and a caustic treated polarizedpolyvinyl alcohol (PVA) film, wherein the PVA film is laminated inbetween the two TAC films. The films are roller laminated together in anenvironment between about 50 and 110 degrees Celsius for between about0.1 and 3 hours to produce a polar TAC-PVA-TAC film ensemble having goodpolarization, color and cosmetics, wherein the optical adhesive productis present in uniformly thin layers, each less than about 5 microns.

The process additionally includes, following the laminating step,further laminating the polar TAC-PVA-TAC film ensemble to an opticalsubstrate with an adhesive system. The adhesive system is one of asingle layer adhesive system, a bi-layer adhesive system or a tri-layeradhesive system to form a laminated substrate. Subsequently, the processincludes surfacing the substrate which comprises a semi-finished (SF)ophthalmic lens, coating the surfaced lens, and edging the coated lens.The optical adhesive product avoids film separation in the polarTAC-PAV-TAC film ensemble during edging.

The ophthalmic lens is made from polyepisulfide material having an indexof refraction of 1.74 and the coating step includes coating the surfacedlens with a coating, for example, a protective coating, hard coating,anti-reflective coating, photochromic coatins, tinted coating, anti-fogcoating, or anti-smudge coating. The the resulting laminated substrateincludes an optical stack having the following layers in order, apolyepisulfide lens, an adhesive system, TAC film, the optical adhesiveproduct, PVA film, the optical adhesive product, TAC film and a coating.

BRIEF DESCRIPTION OF THE DRAWINGS

The advantages, nature, and various additional features of the inventionwill appear more fully upon consideration of the illustrativeembodiments now to be described in detail in connection withaccompanying drawings. In the drawings wherein like reference numeralsdenote similar components throughout the views:

FIG. 1 is a schematic diagram of the equipment used for the peel forcetest.

FIG. 2 is a graph showing the relationship between force and distancewhen water is added to the laminated film.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In this application the following definitions apply to the various wordsmentioned.

Film refers to single layer of material, for example a TAC film or a PVAfilm.

Ensemble or film ensemble refers to two or more individual film layersthat are adhered together.

Polar or polarizing film refers to a film ensemble which performs apolarizing function.

HCl means hyrdochoric acid.

HMA means a hot melt adhesive.

PVA refers to a polarized polyvinyl alcohol film, that is, a single filmlayer.

PVOH refers'to polyvinyl alcohol, that is, a solid dissolved in a liquidand is used as a component in an adhesive system.

SF means a semi-finished lens, that is a lens with one optical surfaceand another surface that needs to be ground to the wearer's Rx.

TAC refers to a triacetate cellulose or cellulose triacetate film, thatis, a single film layer.

Rx means a prescription for an ophthalmic lens.

The suffix ‘wt’ means that the preceeding compound is present in apercentage based on weight. Unless otherwise indicated, all percentagesare on a weight basis.

Wheel edging or wet wheel edging means mechanical shaping of theperimeter of an optical article using a grinding wheel typical in theoptical industry without or with water.

Wet peel force, wet adhesion or peel force is a measure of theresistance of films to separate during Peel Force testing as measured byan Instron device, where the films are mechanically pulled apart fromeach other.

The polarized film ensemble is a TAC-PVA-TAC sandwich with a water basedadhesive between each TAC film and the PVA film, such as a PVOH basedadhesive. The PVOH adhesive is very sensitive to water, therefore, theTAC-PVA-TAC film has very poor wet adhesion properties. As aconsequence, the film can be easily separated by water when placed inwater for about 15 min at room temperature, as measured by a peel forcetest to separate the TAC from the PVA film. While a significant peelforce can be measured in dry conditions, the presence of water causesthe adhesion force to drop to zero.

Because of the water sensitivity of this adhesive and subsequently thewater sensitivity of the polarizing film ensemble and its poor wetadhesion, the laminated lens made with such a polarizing film ensembleat its surface has a technical problem during wet wheel edging in Rxlens processing. It has been found that the TAC-PVA-TAC film ensemble isseparated at the edge of the lens due to the combined detrimentaleffects of the wheel edging force and adhesion weakening brought aboutby the water applied during the edging process.

Therefore, there is a need to improve the TAC-PVA-TAC's internal wetadhesion force in order to overcome this wheel edging problem and obtainbetter edging performance for ophthalmic lens applications. Some priorart solutions have proposed to specify the types of edgers or edgingcycle (limited to certain edges). For example, the use of knife edgersdoes not induce such film ensemble separation, since the nature of theapplied mechanical force to remove material is different from wheeledging. Some other prior art patent applications have proposed the useof metal crosslinks (U.S. Published Patent Application 2008/0278810) andother crosslinking agents such as glyoxal (U.S. Published PatentApplication 2006/0155061) in a PVOH based adhesive to, improve thefilm's water resistance. However, tests using these proposed adhesivesfailed to achieve the minimum requirements for adhesion levels duringwet edging.

Glyoxal is a well known crosslinking agent in the PVA film industry toimprove water resistance. However, there has not been any suggestion touse it as an adhesive to bond PVA to TAC. Furthermore, in the prior U.S.Pat. No. 7,704,572, glyoxal is always used as an additive, i.e. used asa cross-linking agent in minor quantity in an adhesive formulation whichrepresents always the main compound of the formulation.

The embodiments of the present invention present new and specificconditions/compositions including glyoxal with PVOH that can solve theabove-noted challenging technical problems. More particularly, usingGlyoxal itself alone and/or as major compound in the adhesiveformulation represents a new and unexpected result.

In this patent application, a glyoxal adhesive system is disclosed toimprove the wet adhesion between TAC-PVA films within the ensemble, andtherefore to improve the wheel edging behavior in the presence of water.The chemical formula and molecular diagram for Glyoxal are as follows:

The inventive adhesive system is based on glyoxal chemistry with glyoxalas a main component. Thanks to the reactive group in glyoxal, it wasdiscovered that it can be used to react both to the PVA film's and theTAC film's surface OH group in an acid environment when heated. Thisreaction can build a very strong bonding between the PVA film and theTAC film. The most important result is that the wet adhesion between PVAand TAC film is greatly improved.

Another benefit of using gloxal as an adhesive for film is that it has awater based chemistry. Therefore it can be easily used in filmlamination to replace the current water-based industrial PVOH adhesive.Also, it can be combined (but as major compound in the formulation) withother water based adhesive chemistry, such as PVOH to provide a superstrong adhesive for TAC and PVA to be able to overcome the wheel edgingproblem of the current polar film ensemble.

Part of the solution to obtain a good adhesive system, is to prepare anacidic glyoxal formulation. The preferred organic acid tested to date isHCl.

EXAMPLE S

The present invention will be described in greater detail below throughthe examples. However, the present invention is not limited only tothese examples listed.

Example 1

In this example, glyoxal itself, is used as the adhesive for TAC-PVAfilm. A commercial glyoxal water solution (40% wt/Sigma-Aldrich #128465)was combined with a few drops of 1.0N HCl to obtain a solution with a pH<5 for use as an adhesive solution for TAC and PVA film. The TAC film(FT80SZ) was made by Fuji Corp and was subject to a caustic treatmentbefore lamination. The caustic treatment condition was 10% NaOH for 4min at 60° C. The PVA polar film was made by Onbitt from Kuraray 2400grade clear PVA. Then, the TAC and PVA film were laminated by a rollerlamination device with the formulated glyoxal adhesive then subjected toa temperature of 90° C. for 0.5 to 3 hrs. The obtained polar TAC-PVA-TACfilm ensemble exhibited good polarization, color and cosmetics ascompared to commercial polar TAC-PVA-TAC film ensemble made by Onbittwith PVOH based adhesive. However, it has much better adhesion thancommercial polar film ensembles made with PVOH based adhesive,especially wet adhesion by peel force measurement as shown in thefollowing Table 1, which lists wet peel force for two combinations ofpolar film and adhesive.

TABLE 1 Polar PVA/ Wet peel force TAC film Types Adhesive by InstronExample 1 Glyoxal with HCl >10N Commercial Polar PVOH based adhesive ~1N film by Onbitt

The values under the Wet Peel force by Instron in column 3, wereobtained by the Instron peel force test method consisting of: 180°T-peel test with a film ensemble width of 25 mm at the peel speed of0.75 min/min in the presence of water. The water drops were continuouslyadded between the TAC and PVA films during the T-peel test.

Examples 2-5

This is the same as in Example 1 except the glyoxal is formulated with asmall amount of PVOH water based adhesive. The film lamination and curecycle is the same as in Example 1. The obtained polar TAC-PVA-TAC filmensemble properties were as good as in Example 1. The wet adhesionresults are shown in following Table 2.

TABLE 2 Polar PVA/ Wet Peel Force TAC film Type Adhesive measured byInstron Example 2 36 wt % glyoxal/ 8-10N 1 wt % PVOH Example 3 10 wt %glyoxal/   16N 3.4 wt % PVOH Example 4 5 wt % glyoxal/ 8-10N 3.4 wt %PVOH Commercial Polar PVOH based   ~1N Film from Onbitt adhesive

Examples 5-6

The obtained Polar TAC/PVA/TAC film ensembles made in Ex. 3 and 4 werecaustic washed and coated with latex-HMA as an adhesive layer to belaminated onto a 1.74 SF lens (0.75 base) that has been pre-washed andcoated with latex. In this example the adhesive used is the tri-layeradhesive system as described in our published PCT patent application WO2011/053329, the contents of which are incorporated herein by referencethereto.

The film lamination onto the 1.74 lens was done at 20psi membranepressure at 90° C. for 3 min and then post-annealed at 100° C. for 6 hr.This lamination process has been described in our published PCT patentapplication WO/2012/078152, the contents of which are incorporatedherein by reference thereto.

After lamination, the lens was surfaced to a minus power of −12.0D thenhard-coated. In lieu of, or in addition to the hard coating anothercoating could be used, for example a protective coating, anti-reflectivecoating, photochromic coating, tinted coating, anti-fog coating, andanti-smudge coating. Then the lens was wet wheel edged using a Triumphedger (Serial No 25038152) to a rectangular shape.

Edging Result: There was no adhesion failure or film separation seen onthese lenses after edging.

Comparative Example 1

This is the same as Examples 5 and 6 except that the film ensemble wasthe commercial TAC-PVA-TAC made with PVOH adhesive by Onbitt Corp. Theobtained lenses were surfaced, Hard Coated and edged in the sameconditions.

Edging Result: There were many locations where adhesion failure and filmseparation was seen after edging. Such results would be rejected byquality control.

Comparative Example 2

This is the same as Examples 5 and 6 except that the film was preparedwith an adhesive formulation containing a low amount of 0.8% Glyoxal ina 3.9% PVOH adhesive solution. The obtained lenses were surfaced, hardcoated and edged in the same conditions.

Edging Result: While there were some improvements in film separationspercentage after edging, some failures were present.

The wet adhesion peel force of this film was measured at <5 N.

Comparative Example 3

This is the same as Comparative Example 2 where glyoxal is replaced by0.8% formaldehyde, a mono-functional aldehyde in a 3.9% PVOH adhesivesolution. The obtained lenses were surfaced, hard coated and edged inthe same conditions.

Edging Result: There was a significant amount of film separation seenafter edging. Therefore, there was no improvement in film adhesion withmono-functional aldehyde of formaldehyde as an adhesive or adhesivepromotion for TAC and PVA film.

The wet adhesion peel force test of the film made by formadehyde is verypoor at <1N which is similar to the commercial polar film by PVOHadhesive.

It has been noticed that good wet peel force is one necessaryrequirement for good wheel edging results, however, it does notguarantee good wheel edging results. One reason for poor edging resultswith good wet adhesion could be too thin an adhesive layer of Glyoxaland/or the adhesive lacking sufficient toughness to withstand themechanical abrasion associated with wheel edging.

Therefore, a good ratio of Glyoxal and water based polymer such as PVOHis important to get best edging results by combining high wet adhesionand sufficient adhesive thickness to provide the required adhesion andadequate toughness of the laminated polar film to withstand the wheeledging force. Comparative Example 3 demonstrate that the used ofbi-functional aldehyde compound is mandatory.

Other tests have demonstrated that the PVOH can be replaced by otherwater based polymers which have OH groups in the structure orpolyurethane that contains hydroxy groups. Examples of other of waterbased polymers that can be employed in the products, applications andprocesses of the invention are polyhydroxyethyl cellulose,polyhydroxypropyl cellulose, poly(sodium carboxymethyl cellulose), andagarose. In agarose, the hydroxyl groups are located adjacent to eachother, which is the ideal spacing for glyoxal crosslinking.

When PVOH wt % is lower than 5 wt % in water, as in Examples 2-4, ahigher percentage of glyoxal is acceptable without encountering a veryshorter pot life or gel issue However, when the PVOH wt is more than 8wt% in water, then there is a risk of reduced pot life and gel formationwithin about 5 min at room temperature at 10 wt % glyoxal as shown inTable 3.

TABLE 3 Glyoxal % PVOH % by Weight by Weight Gel Formation 10% 3.4% No10%  8% Yes

Accordingly, the PVOH amount should be monitored to remain less than 8%,preferably less than 6%, if glyoxal is present in the range of 10% byweight.

Generally, the thickness of the glyoxal adhesive will be below 5 micron,preferable below 2 micron. The above glyoxal compounds provide a wetpeel force greater than 6N, preferably greater than 10N. For glyoxalalone the peel force is typically in the range of 8 to 12N, preferablyabout 10N. For the glyoxal and water based polymer adhesive systems, thepeel force is typically in the range of 6 to 18N, preferably about 8 to16N.

Glyoxal alone in the pH adjusted form as an adhesive provides improvedwet adhesion. Glyoxal as major compound and a water based polymer,preferably PVOH as a minor compound provides even greater wet adhesion.The preferred embodiment comprises glyoxal 10% by weight, PVOH between 3and 4% by weight, and less than 1% by weight of an acid, preferably HClto adjust the pH to below 6, preferably around 5.

Peel force adhesion was measured by the T-peel (180 degrees) forcemethod using Instron equipment. As can be seen in FIG. 1. The Instronequipment has a holder 10 at the bottom to hold one layer 14 b of thefilm ensemble 14 stationary. At the top, an arm 12 pulls the other layer14 a of the film at increasing levels of force. When the arm moves,evidencing film ensemble separation into individual films 14 a and 14 b,the equipment records the current force level. In FIG. 1 the film isabout 178 mm long and 25 mm wide. The arm is set to move at between 0.5and 1.25 mm/min. The most important use of this test is to measure wetadhesion by adding water between the TAC and PVA films in direction 16during peel testing to get both dry and wet adhesion force measurementsfor polar film.

The commercial polar film has very poor wet adhesion. A graph of force(in Newtons—N) vs. distance (in mm) is shown in FIG. 2. In the range ofabout 10 to 28 mm the peel force was rising gradually. Note that as soonas the water was added at point 20, the peel force dropped to zero. Inother words, the film layers basically separated upon contact with thewater.

The adhesives, applications and processes described herein can be usedwith any films in ophthalmic lens applications. The inventive conceptsare especially useful for film laminated lens applications where filmseparation is an issue during wheel edging. The invention provides acost effective and easily implemented to improve film edging performancewith any kind of wheel edgers.

Having described preferred embodiments for optical adhesive products andprocesses for manufacturing same with additional laminating steps,(which are intended to be illustrative and not limiting), it is notedthat modifications and variations can be made by persons skilled in theart in light of the above teachings. For example, other equivalentcompounds can be included in the optical adhesive product depending onthe intended application. In addition, other lens laminating steps, orsteps in different orders may be carried out to achieve similar results.It is therefore to be understood that changes may be made in theparticular embodiments of the invention disclosed which are within thescope and spirit of the invention as outlined by the appended claims.Having thus described the invention with the details and particularityrequired by the patent laws, what is claimed and desired protected byLetters Patent is set forth in the appended claims.

What is claimed is:
 1. An optical adhesive product for improved vetadhesion in laminated opthalmic lenses comprising: a glyoxal watersolution, said glyoxal water solution containing between about 5% andabout 50% by weight glyoxal, said glyoxal water solution being adjustedto a below about 7, wherein the optical adhesive product comprises anadhesive for laminated ophthalmic lens that demonstrates a wet peelforce strength above about 6 Newtons.
 2. The product of claim 1, whereinthe glyoxal water solution consists of: glyoxal present in an amountbetween 30% and 50% by weight; less than 1% by weight of a pH adjustingcompound; and the remainder water, wherein the optical adhesive productis devoid of other compounds and demonstrates a wet peel force strengthbetween about 8 to about 12 Newtons.
 3. The product of claim 2, whereinsaid pH adjusting compound comprises hydrochloric acid (HCl) and theoptical adhesive product is adjusted to a pH below about
 6. 4. Theproduct of claim 1 further comprising: a water based polymer that ispresent in an amount less than or equal to the amount of glyoxal.
 5. Theproduct of claim 4, wherein the optical adhesive product comprises:glyoxal present in an amount between about 3% and 40% by weight; saidwater based polymer comprising polyvinyl alcohol (PVOH) polymer presentin an amount between 2% and 6% by weight; less than 1% by weight of a.pH adjusting compound; and the remainder water, wherein the opticaladhesive product demonstrates a wet peel force strength between about 6to about 18 Newtons.
 6. The product of claim 5, wherein said glyoxal ispresent in an amount of about 5% -10% by weight and said PVOH is presentin an amount of about 3%-4% by weight, wherein the optical adhesiveproduct demonstrates a we peel force strength between about 10 to about16 Newtons,
 7. The product of claim 4, wherein the water based polymeris selected from the group consisting of water based polymers containingOH groups in the structure, polyurethanes (PU) containing hydroxygroups, hydroxyethyl cellulose, hydroxypropyl cellulose, sodiumcarboxymethyl cellulose, and agarose.
 8. A process for manufacturing anoptical adhesive product for improved we adhesion in laminated opthalmiclenses comprising the steps of: providing a glyoxal water solutioncontaining between about 3% and about 40% by weight glyoxal; and addingan acid for adjusting the pH of said glyoxal water solution to belowabout 6 to form the optical adhesive product that demonstrates a wetpeel force strength above about 6 Newtons.
 9. The process of claim 8,wherein said adding step includes adding a water based polymer in anamount less than the glyoxal water solution.
 10. The process of claim 9,wherein the optical adhesive product includes: glyoxal present in anamount between about 3% and 40% by weight; said water based polymercomprising polyvinyl alcohol (PVOH) polymer present in an amount between2% and 4% by weight; less than 1% by weight of the acid; and theremainder water, wherein the optical adhesive product demonstrates a wetpeel force strength between about 6 to about 18 Newtons.
 11. The processof claim 10, wherein said glyoxal is present in an amount of about5%-10% by weight and said PVOH is present in an amount of about 3%-4% byweight, wherein the optical adhesive product demonstrates a we peelforce strength between about 10 to about 16 Newtons,
 12. The process ofclaim 10, wherein the water based polymer is selected from the groupconsisting of water based polymers containing OH groups in thestructure, polyurethanes (PU) containing hydroxy groups, hydroxyethylcellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, andagarose.
 13. The process of claim 10, wherein the acid is hydrochloricacid (HCl).
 14. The process of claim 8, wherein following said addingstep the process further includes: providing optical films; introducingthe optical adhesive product between the films; and laminating theoptical films together,
 15. The process of claim 14, wherein saidproviding optical films step includes providing two triacetate cellulose(TAC) films and a caustic treated polarized polyvinyl alcohol (PVA)film, wherein the PVA film is laminated in between the two TAC films.16. The process of claim 15, wherein said laminating step comprisesroller laminating the films together in an environment between about 50and 110 degrees Celsius for between about 0.1 and 3 hours to produce apolar TAC-PVA-TAC film ensemble having good polarization, color andcosmetics, wherein the optical adhesive product is present in uniformlythin layers, each less than about 5 microns.
 17. The process of claim16, wherein following said laminating step, the process includes thestep of further laminating the polar TAC-PVA-TAC film ensemble to anoptical substrate with an adhesive system selected from the groupconsisting of a single layer adhesive system, a bi-layer adhesive systemand a tri-layer adhesive system to form a laminated substrate.
 18. Theprocess of claim 17, wherein following said further laminating step, theprocess includes the further steps of: stalking the substrate whichcomprises a semi-finished (SF) ophthalmic lens; coating the surfacedlens; and edging the coated lens, wherein the optical adhesive productavoids film separation in the polar TAC-PAV-TAC film ensemble duringedging.
 19. The process of claim 18, wherein the ophthalmic lens is madefrom polyepisulfide material having an index of refraction of 1.74 andthe coating step includes coating the surfaced lens with a coatingselected from the group consisting of protective coating, hard coating,anti-reflective coating, photochromic coatins, tinted coating, anti-fogcoating, and anti-smudge coating.
 20. The process of claim 17, whereinthe resulting laminated substrate includes an optical stack having thefollowing layers in order, a polyepisulfide lens, an adhesive system,TAC film, the optical adhesive product, PVA film, the optical adhesiveproduct, TAC film and a coating.